1.) to ejaculate profusely. "Brains" discussing slang for testicles. 2.) Refers to the slaughterhouse process of removing the animal's brains with compressed air required into the skull through the opening where the spinal-cord enters. The brains are then packed and sent to markets in Korea and Asia as meals. This term appeared in the February 4, 2008, Washington Post article titles, "Inhaling Pig Brains can be Cause of New disease."